Linux Shell script programming-detailed explanation of SCP commands

Linux Shell script programming-SCP command details

Command: SCP

There are three common methods to copy files between Linux:

The first is FTP, that is, one of the Linux installation FTP server, so that another client program using FTP can be used to copy files.

The second method is to use the samba service, similar to the Windows file copy method, which is simple and convenient.

The third is to use the SCP command to copy files.

SCP is a file copy with security and is used for SSH logon. For example, to copy the current file to another remote host, you can run the following command.

SCP/home/Open/tools.tar.gz
Root@113.223.228.175:/home/root

Then, you will be prompted to enter the login password of the root user of the other 113.223.228.175 host, and copy the password.

If you want to copy files from the remote host to the current system, it is also very easy.

SCP

Root @ 113.223.228.175:/Home/root/tools.tar.gz
Home/Open/tools.tar.gz

The SCP command of Linux can copy files and directories between Linux;

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SCP command
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SCP can copy files between two Linux Hosts;

Basic command format:
SCP [optional parameter] file_source file_target

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Copy from local to remote
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* Copy a file:
* Command format:
SCP local_file remote_username @ remote_ip: remote_folder
Or
SCP local_file remote_username @ remote_ip: remote_file
Or
SCP local_file remote_ip: remote_folder
Or
SCP local_file remote_ip: remote_file

The user name is specified for the 1st and 2nd commands. After the command is executed, you need to enter the password. Only the remote directory is specified for the 1st command. The file name remains the same, and the file name is specified for the 1st command;
No user name is specified for the 3 and 4 commands. After the command is executed, enter the user name and password. Only the remote directory is specified for the 3rd commands. The file name remains the same and the file name is specified for the 4th commands;
* Example:
SCP/home/SPACE/music/1.mp3 root@www.cumt.edu.cn:/home/root/Others/music
SCP/home/SPACE/music/1.mp3 root@www.cumt.edu.cn:/home/root/Others/music/001.mp3
SCP/home/SPACE/music/1.mp3 www.cumt.edu.cn:/home/root/Others/music
SCP/home/SPACE/music/1.mp3 www.cumt.edu.cn:/home/root/Others/music/001.mp3

* Copy directory:
* Command format:
SCP-r local_folder remote_username @ remote_ip: remote_folder
Or
SCP-r local_folder remote_ip: remote_folder

1st user names are specified, and the password needs to be entered after the command is executed;
2nd user names are not specified. After the command is executed, enter the user name and password;
* Example:
SCP-r/home/SPACE/music/root@www.cumt.edu.cn:/home/root/Others/
SCP-r/home/SPACE/music/www.cumt.edu.cn:/home/root/Others/

The above Command copies the local music directory to the remote others directory, that is, there is a remote ../Others/music/directory after the copy.

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Copy from remote to local
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From remote to local, you only need to replace the last two parameters of the local command to remote;

For example:
SCP root@www.cumt.edu.cn:/home/root/Others/music/home/SPACE/music/1.mp3
SCP-r www.cumt.edu.cn:/home/root/Others/home/SPACE/music/

The simplest application is as follows:

SCP Local User Name @ IP Address: file name 1 remote user name @ IP Address: file name 2

[Local username @ IP Address:] You may not need to enter the password corresponding to the remote username.

Several useful parameters:

-V is the same as-V in most Linux commands. It is used to display the progress. It can be used to view the connection, authentication, or configuration error.

-C enable compression options.

-P: select the port. Note that-P has been used by RCP.

-4 Use the IPv4 address forcibly.

-6 Use IPv6 addresses forcibly.

 

Note:
1. If the remote server firewall has special restrictions, SCP must go through the special port. The specific port used depends on the situation. The command format is as follows:
# SCP-P 9922
Remote@www.AAA.com:/usr/local/sin. sh/home/Administrator
2. When using SCP, pay attention to whether the user has the permission to read the corresponding files on the remote server.